Combined lock and burglar-alarm.



"0. 660,737. 3. RITCHIE. Patented Oct. 30,1900, COMBINED LOCK AND BUBGLAR ALARM.

(Appliclfion filed Feb. 26, 1900.}

(No Model.)

UNHED STATES PATENT OFFICE.

SAMUEL RITCHIE, OF TOMAHAWK LAKE, \VISCONSIN, ASSIGNOR OF ONE- THIRD TO EUGENE R. LE FEVRE, OF SAMEPLAGE.

COMBINED LOCK AND BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 660,737, dated October 30, 1900.

Application filed February 26, 1900. Serial No 6,553. (No model.)

To all whmn it may concern.-

Be it known that I, SAMUEL RITCHIE, of Tomahawk Lake, in the county of Oneida and Slate of Wisconsin, have invented a new and useful Improvement in a CombinedLock and Burglar-Alarm, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

My invention has relation to improvements in combined locks and burglar-alarms.

The object of the invention is to provide an improved and simple construction of such character as to provide not only a lock, but also a provision for sounding an alarm should an attempt be made to open a door to which the improved mechanism is applied.

With the above primary object and other incidental objects in view the invention consists of the devices and parts or their equivalents, as hereinafter set forth.

In the accompanying drawings, Figure 1 is an under side view of the device. Fig. 2 shows the device properly applied to a door. Fig. 3 is a view similar to Fig. 1 with one side of the casing removed. Fig. 1 is a section through the slidable trigger and also through a fragment of one side of the casing, the section being on the line 4 1 of Fig. 3; and Figs. 5 and 6 are detail views of certain parts of the device shown in Figs. 1, 2, and 3.

Referring to the drawings, the numeral 11 indicates the casing of the device, which may be of any desirable form of construction, although the form shown in the accompanying illustrations is best adapted for accommodating the several parts of the mechanism. Within the casing is arranged a suitable slidable trigger 12, which is guided in its move ments by means of an overlapping guidestrip 13. The trigger is preferably curved and shown to conform to the curvature of the inner end of a hammer 14, which inner end of the hammer lies between the sides of the casing and is pivoted on a transverse pivotpin 15. The hammer extends outside of the casing through a slot 16 and near its outer end is provided with a hammer-head l7,which when the hammer is actuated will be forcibly brought into contact with the bottom of a cartridge chamber or recess 18. The inner end of the hammer is also provided on one edge with a shoulder 19, with which the end of the trigger is adapted to engage in order to hold the hammer in cocked adjustment, as most clearly shown in Fig. 3. Said inner end of the hammer is further provided with a recess 20, against the rear corner of which the free end of a flat spring 21 is adapted to bear, the bearing-point or point of contact being eccentric to the axis of the hammer. The rear end of the trigger is provided with an outstanding lug 22, which is formed with a threaded opening to receive the threaded inner end of a contact-pin 23, said contactpin passing out of the end of the casing and being provided on its outer end with a head or en1argement24. By reason of the pin 23 having a threaded engagement with the lug 22 said pin may be accurately and conveniently set to suit requirements. The slidable trigger is, furthermore, provided with an elongated slot 25, and extending through this slot and entering one side of the casing is a small stud 26, provided at one end with a rearwardly-extending lug 27. A coiled spring 28 is arranged within the slot, and one end of said spring bears against the rear end wall of the slot, and the oppositeend of said spring bears against the stud 26.

The numeral 29 indicatesa brace-bar which is pivoted at one end to one of the side pieces of the casing, near the end of said side piece, and the free end of this bar is provided with a series of teeth or prongs 30. To the opposite end of the same side piece of the casing is pivoted an arm 31, said arm having its free end turned at an angle, as indicated by the numeral 32, the edge of said angularly-turned end being formed with a series of teeth or prongs 33.

In Fig. 2 of the drawings a fragment of the door-frame and also a fragment of the door are shown. The fragment of the door-frame is indicated by the numeral 34 and the fragment of the door by the numeral 35. From this figure it will be seen that the arm 31 is fitted to the edge of the'door-frame and in the space formed between said edge and the free edge of the door when said door is closed the prongs 33 at the edge of the angularly-bent portion 32 engaging the woodwork of the door-frame, as clearly shown. The device extends outwardly in a horizontal plane and is braced by the brace-bar 29, the prongs of said brace-bar engaging the door-frame. When the device is arranged as described, the head 24 of the pin 23 will bear against the inner side of the door, and the door is therefore locked against being opened from the outside. In order to set the alarm, all that is necessary to be done is to pull the hammer outwardly to the cocked position illustrated in the several figures of the drawings. If now an attempt is made to open the door from the outside the slightest force exerted against the door will cause the pin 23 to be forced inwardly, and the pin in turn will cause a movement of the slidable trigger 12 against the contrary force exerted by the spring 28. As said trigger is thus actuated its end will be released from engagement with the shoulder 19 of the hammer, and the moment this release occurs the spring 21, acting eccentrically on the hammer, will cause a forcible down movement of said hammer, the free end of the spring 21 passing into the recess 20. This down movement of the hammer will bring the hammer-head 17 thereof into forcible contact with a cartridge placed in the chamber 18, and hence cause an explosion of said cartridge and a consequent loud report, sufficient to awake the inmates of the house, and thereby advise them that an attempt to burglarize is being made. The function of the spring 28 of course is to return the slidable trigger 12 and the pin 23 to normal position the moment pressure on the head of the pin 23 is removed.

When it is desired to open the door, the brace-bar 29 is thrown outwardly on its pivot, when of course the casing can be turned on its pivot, so as to offer no impediment to the opening of the door.

What I claim as my invention is- The combination of a casing or support adapted to be secured to a fixed part, a springretrieved slidable trigger within the casing, and provided with a projection in line to be engaged by a movable part, a hammer pivoted in the casing and projecting therefrom, the portion of the hammer within the casing provided on one edge with a shoulder which is adapted to be engaged by the end of the trigger when the hammeris cocked, and mechanism acting against the hammer and adapted, when the triggeris released from the shoulder of the hammer by reason of the actuation of said trigger through the movable part striking the projection of the trigger, to cause the hammer to be forcibly turned into contact with a suitable alarm device.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL RITCHIE.

Witnesses:

J 0s. H. JOHNSON, J. E. MULLowNEv. 

